-95.48% is the change from 664 to 30
Calculation steps:
[( 30 - 664 ) ÷ 664] x 100 = -95.48%
Formula
Percentage change = [(30 - 664) / 664] x 100
Subtract the new number by the original number
30 - 664 = -634
-634 ÷ 664 = -0.9548192771084337
-0.9548192771084337 x 100 = -95.48%